Nice looking system Mr. Moebius, Terry Cain really does build a beautiful cabinet.
You speakers have to exhibit some of the back wave issues that were talked about. As the frequency decreases at some point you are getting a stronger wave from the port than from the front of the driver and this wave takes longer to get to you than than the front wave. There must also be something in the design to dampen the higher frequencies or you would be getting them twice. Once from the front and again a bit later from the back. Whether you are sensitive to this or not is another story, but it is there.
You speakers have to exhibit some of the back wave issues that were talked about. As the frequency decreases at some point you are getting a stronger wave from the port than from the front of the driver and this wave takes longer to get to you than than the front wave. There must also be something in the design to dampen the higher frequencies or you would be getting them twice. Once from the front and again a bit later from the back. Whether you are sensitive to this or not is another story, but it is there.